There is a position called "enchufe" (as in socket, or pocket), which is a closed position, so that's a descriptive name; this position is of the dancers relative to each other. The term also came to be used for a position of the dancers relative to the slot (the follower on the upstream end). The two positions did tend to go together historically, but things change.

So the step enchufla ( or "plug her in") places the follower into (and immediately moves out of) a position historically related to a socket-like position.

The thing about recursion problems is that they tend to contain other recursion problems.

I have no idea about terms used for cuban salsa, but are you sure you don't mean "enchúfala"? That's the proper spelling for "plug her in", but if you've only heard it and not read it I could totally get how you missed that "a".